Set forth below is the text of a comment that I recently posted to the discussion thread for another blog entry at this site:
How do you adjust the withdrawal rate based on someone’s age?
The convention in the studies is to go 30 years out. The assumption is that the person will retire at 65. Having the retirement survive for 30 years gets him to age 95. Not too many live beyond that age.
It is of course possible to examine what would happen at all sorts of other ages. I think it can be useful to do that. When Greaney said that a 4 percent withdrawal is “100 percent safe,” he was directing his words at a community of people planning early retirements. I believe that Greaney left his corporate employment at age 39. If he lived to age 95, he would need a plan to survive for 56 years. That’s a lot more than 30 years.
In practical terms, that’s not as much of a problem as it appears to be on first consideration. When retirements fail, they fail because of a stock price crash in the first 10 years. A retirement that is constructed to survive 30 years is likely going to survive 56 years. If you don’t take a big early hit, you are probably going to be fine.
That’s why taking valuations into consideration is so important. The valuation level that applies on the day the retirement begins tells you how much risk there is that you will take on a big hit in the first 10 years. That’s almost the entire story of retirement safety. You don’t want to overlook that.
The safe withdrawal rate concept is great. It reveals all sorts of things that are counterintuitive, things that people would miss if they did not explore safe withdrawal rates. One of the reasons why I fell in love with Greaney’s site when I discovered it is that he put so much focus on safe withdrawal rates.
Of course, it’s important to get the numbers right. That’s where Greaney and I part company. He does not take valuations into consideration. I believe that it is 100 percent imperative to take valuations into consideration. It is my strongly held view that valuations are the most important factor in retirement safety. Because of how they affect that vulnerable period — the first 10 years of the retirement.
Rob


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